Welcome to HVAC-Talk.com, a non-DIY site and the ultimate Source for HVAC Information & Knowledge Sharing for the industry professional! Here you can join over 150,000 HVAC Professionals & enthusiasts from around the world discussing all things related to HVAC/R. You are currently viewing as a NON-REGISTERED guest which gives you limited access to view discussions

To gain full access to our forums you must register; for a free account. As a registered Guest you will be able to:

Participate in over 40 different forums and search/browse from nearly 3 million posts.

First Company Brand

Put in last June, only used a couple of times, it's in a vacation condo.

Would like to see if anyone could give me a little advise on flushing the water condensing coil on this unit.

I got the call to replace the control board on this unit, did that but found another issue. I found the unit shutting down because of the discharge line getting to hot, sensor is on the liquid line coming out of the compressor, just before the reversing valve. My water inlet temp is 70-71deg, but the water outlet temp is hitting 100+deg before the board shuts it down. I pulled the inlet water line off to see maybe it had a clogged screen, no screen, but got rust and gunk out when it back washed from the hose being removed. I removed the water outlet hose same thing. I have tried to shock the unit in hopes the clog will dislodge, but have not had any luck.

This happened to me when I was running open loop except it was the reverse. Unit was shutting down because it got too cold from extremely low flow. The manufacturer (FHP) recommended using Muriatic acid. So I tried flushing in both directions, then I eventually started letting it soak for long periods of time and blasting it out with compressed air regulated down. It took me all day to get clean water out of it. What a hassle. After that I went closed loop with good, clean water and methanol. No problems since.